cast-iron

a cast-iron promise or arrangement is one that can be trusted completely (always before noun) No new business comes with a cast-iron guarantee of success.

Common Names:

Name	Pronounced	Usage
Rouben	-	Biblical Greek, Armenian
Childress	['tʃildris]
Ayler	['eilə]
CornÉ	kawr-NAY	Dutch
JÁN	-	Slovak
Clementia	-	Late Roman